JP2021096010A - Incineration facility control device, incineration facility control method and program - Google Patents

Abstract

To provide an incineration facility control device, an incineration facility control method and a program capable of reducing the size of or eliminating a cooler and recovering heat of exhaust gas while enabling an exhaust gas temperature at a dust collector inlet to reach a target temperature.SOLUTION: In an incineration facility including: a heat exchanger 4 performing reheating by using high temperature exhaust gas of an incinerator 3; a boiler 5a into which exhaust gas from the heat exchanger flows; a dust collector removing dust from exhaust gas of the boiler; and a bypass passage 68 bypassing the heat exchanger in which exhaust gas of the dust collector is reheated, an incineration facility control device 10 includes: a first control section controlling a bypass flow rate of exhaust gas flowing in the bypass passage; and a second control section controlling extraction heat amount extracted from the exhaust gas of the heat exchanger by the boiler. When an exhaust gas inlet temperature at an inlet of the dust collector for inflow of exhaust gas from which heat has been extracted by the boiler is a first temperature or higher, the first control section reduces the bypass flow rate. When the exhaust gas inlet temperature is equal to or higher than a second temperature that is higher than the first temperature, the second control section increases the extraction heat amount.SELECTED DRAWING: Figure 1

Description

The present invention relates to an incinerator equipment control device, an incinerator equipment control method, and a program.

Conventionally, with respect to a dust collector included in an incinerator, it is known that the lower the inlet temperature of the exhaust gas flowing into the dust collector, the higher the dust collection efficiency and the removal efficiency of dioxins. Therefore, various techniques for lowering the inlet temperature of the exhaust gas flowing into the dust collector have been proposed.

For example, Patent Document 1 below discloses a technique for lowering the inlet temperature of the exhaust gas flowing into the dust collector by using the exhaust gas emitted from the dust collector. Specifically, in the technique of Patent Document 1, heat exchange between the exhaust gas emitted from the bag filter (dust collector) and the exhaust gas emitted from the boiler is performed by a heat exchanger. The exhaust gas emitted from the heat exchanger is further cooled by an air cooler placed after the heat exchanger and then enters the dust collector.

Japanese Unexamined Patent Publication No. 11-248142

However, in the technique described in Patent Document 1, the heat exchanger outlet temperature becomes commonplace, and a cooler that cools the exhaust gas is required to maintain the heat resistant temperature of the dust collector, and the dust collector inlet temperature is controlled by the cooling control in the cooler. Need to control. In addition, since all the exhaust gas emitted from the dust collector flows into the heat exchanger, the exhaust gas emitted from the dust collector may recover more heat than necessary from the exhaust gas emitted from the boiler in the heat exchanger. .. In this case, the waste heat in the latter stage increases, and the thermal efficiency of the entire system is lowered.

In view of the above problems, an object of the present invention is an incinerator capable of recovering the heat of exhaust gas while reducing the size or omitting the cooler and keeping the exhaust gas inlet temperature at the inlet of the dust collector at the target temperature. The purpose is to provide control devices, incinerator control methods, and programs.

In order to solve the above-mentioned problems, the incineration equipment control device according to one aspect of the present invention includes a heat exchanger that allows high-temperature exhaust gas discharged from the incinerator to pass through and reheats with the high-temperature exhaust gas, and the heat. The boiler into which the exhaust gas discharged from the exchanger flows in, the dust collector that removes the exhaust gas discharged from the boiler, and the heat exchanger in which the exhaust gas discharged from the dust collector is reheated are discharged from the dust collector. A first control unit that controls the bypass flow rate of the exhaust gas flowing through the bypass path and the boiler are discharged from the heat exchanger, which is an incineration facility control device in the incineration facility including a bypass path for bypassing the exhaust gas. The first control unit includes a second control unit that controls the amount of heat extracted from the exhaust gas, and the first control unit has a first exhaust gas inlet temperature at the inlet of the dust collector into which the exhaust gas extracted by the boiler flows. When the temperature is equal to or higher than the temperature, the bypass flow rate is reduced, and the second control unit increases the heat extraction amount when the exhaust gas inlet temperature is higher than the first temperature.

In the incineration equipment control method according to one aspect of the present invention, the high temperature exhaust gas discharged from the incinerator passes through, and the heat exchanger that reheats with the high temperature exhaust gas and the exhaust gas discharged from the heat exchanger flow in. A bypass path in which the exhaust gas discharged from the dust collector bypasses the boiler, a dust collector for removing dust from the exhaust gas discharged from the boiler, and the heat exchanger in which the exhaust gas discharged from the dust collector is reheated. A method for controlling incineration equipment, wherein the first control unit controls the bypass flow rate of exhaust gas flowing through the bypass path, and the second control unit discharges the boiler from the heat exchanger. Including controlling the amount of heat extracted from the exhaust gas, the first control unit has an exhaust gas inlet temperature at the inlet of the dust collector into which the exhaust gas extracted by the boiler flows into the first temperature or higher. In some cases, the bypass flow rate is reduced, and the second control unit increases the heat extraction amount when the exhaust gas inlet temperature is equal to or higher than the second temperature higher than the first temperature.

A program according to one aspect of the present invention includes a heat exchanger through which high-temperature exhaust gas discharged from an incinerator passes and reheating with the high-temperature exhaust gas, and a boiler into which the exhaust gas discharged from the heat exchanger flows. Incineration including a dust collector for removing dust discharged from the boiler and a bypass path for bypassing the heat exchanger in which the exhaust gas discharged from the dust collector is reheated by the exhaust gas discharged from the dust collector. A program in the facility, the first control unit that controls the bypass flow rate of the exhaust gas flowing through the bypass path, and the first control unit that controls the amount of heat extracted by the boiler from the exhaust gas discharged from the heat exchanger. The first control unit functions as two control units, and the first control unit sets the bypass flow rate when the exhaust gas inlet temperature at the inlet of the dust collector into which the exhaust gas extracted by the boiler flows is equal to or higher than the first temperature. The second control unit increases the heat extraction amount when the exhaust gas inlet temperature is equal to or higher than the second temperature higher than the first temperature.

According to the present invention, the heat of the exhaust gas can be recovered while the cooler is miniaturized or omitted, and the exhaust gas inlet temperature at the inlet of the dust collector is set to the target temperature.

It is a figure which shows an example of the structure of the incinerator which concerns on one Embodiment of this invention. It is a figure which shows an example of the relationship between the 1st control process which concerns on this embodiment, and the exhaust gas inlet temperature PV _{1 of a dust collector.} It is a figure which shows an example of the relationship between the exhaust gas inlet temperature of the dust collector which concerns on this embodiment, the outlet temperature of the heat medium of a boiler, and the circulation amount of a heat medium. It is a block diagram which shows an example of the functional structure of the incinerator equipment control device which concerns on the same embodiment. It is a flowchart which shows an example of the processing flow in the incinerator equipment control apparatus which concerns on the same embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The present invention relates to an incinerator equipment control device that controls a process executed by an apparatus included in the incinerator equipment. The incinerator in the present embodiment is, for example, an incinerator for incinerating sewage sludge generated in sewage treatment. The incinerator is not limited to this example.

<1. Incinerator configuration>
First, the configuration of the incinerator according to the present embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a diagram showing an example of the configuration of the incinerator 1 according to the embodiment of the present invention.

As shown in FIG. 1, the incinerator 1 includes a dehydrator 2, an incinerator 3, a heat exchanger 4, a boiler 5a, a boiler 5b, a generator 6a, a generator 6b, a dust collector 7, a TI (Temperature Indication) 8, and an incinerator. Equipment control device 10, TIC (Temperature Indication Controller) 11, TIC12, TIC13, TIC14, PLC (Programmable Logic Controller) 15, bypass valve 21, supercharger 22, bypass valve 23, TIC24, heat medium circulation pump 31, VVVF ( Variable Voltage Variable Frequency) Includes an inverter 32, a TIC 33, a nozzle 41, a valve 42, a TIC 43, and a CIC (moisture meter) 51. In the following, "controller" is used as a general term including TIC11-14, TIC24, TIC33, TIC43, and CIC51.

The dehydrator 2 produces an incinerator. The target of incineration is, for example, dehydrated sludge. The dehydrator 2 is supplied with concentrated sludge in which the sewage sludge generated in the sewage treatment is concentrated via the route 60. The dehydrator 2 produces dehydrated sludge by dehydrating the supplied concentrated sludge. The dehydrated sludge generated by the dehydrator 2 is supplied to the incinerator 3 via the path 61. The dehydrator 2 of the present embodiment is realized by, for example, a heating dehydrator. The dehydrator 2 is not limited to this example.

The incinerator 3 incinerates the dehydrated sludge (target of incineration) generated by the dehydrator 2. In the incinerator 3, exhaust gas is generated by incinerating the dehydrated sludge. The temperature of the exhaust gas is about 850 ° C. The exhaust gas generated in the incinerator 3 is supplied to the heat exchanger 4 via the path 62. The incinerator 3 is provided with a nozzle 41 capable of spraying cooling water inside. The cooling water is sprayed from the nozzle 41 through the path 70. The amount of cooling water sprayed by the nozzle 41 is controlled based on the opening degree of the valve 42 provided in the path 70.

The heat exchanger 4 exchanges heat between the exhaust gas flowing from the incinerator 3 via the path 62 and the exhaust gas flowing from the dust collector 7 via the path 65. Since the exhaust gas flowing in from the route 62 has a higher temperature than the exhaust gas flowing in from the route 65, it is also referred to as "high temperature exhaust gas" below. On the other hand, since the exhaust gas flowing in from the route 65 is lower in temperature than the exhaust gas flowing in from the route 62, it is also referred to as "low temperature exhaust gas" below.

The high-temperature exhaust gas is discharged to the path 63 (the heat recovery path in the subsequent stage) through the path 71 inside the heat exchanger 4. The low temperature exhaust gas is discharged to the path 66 through the path 72 inside the heat exchanger. In heat exchange, heat is transferred from a hot object to a cold object, the temperature of the hot object is lowered, and the temperature of the cold object is raised. Therefore, in the heat exchange in the heat exchanger 4, heat is transferred from the high temperature exhaust gas passing through the path 71 to the low temperature exhaust gas passing through the path 72, the temperature of the high temperature exhaust gas is lowered, and the temperature of the low temperature exhaust gas is raised. That is, the heat exchanger 4 cools the high-temperature exhaust gas and heats (reheats) the low-temperature exhaust gas.

As a result of heat exchange, the high temperature exhaust gas is cooled to about 600 ° C. The high-temperature exhaust gas cooled by the heat exchanger 4 is supplied to the boiler 5a via the path 63.

The boiler 5a extracts heat from the exhaust gas discharged from the path 71 and flowing from the heat exchanger 4 through the path 63. The boiler 5a of the present embodiment is realized by, for example, a heat medium boiler, a steam boiler, or the like. Hereinafter, an example in which the boiler 5a is a heat medium boiler will be described. The boiler 5a is not limited to this example.

The boiler 5a exchanges heat between the heat medium supplied from the heat medium circulation pump 31 (for example, heat medium oil) and the exhaust gas flowing in from the heat exchanger 4 via the path 63. In the boiler 5a, the exhaust gas flowing from the heat exchanger 4 is an object having a high temperature, and the heat medium is an object having a low temperature. Therefore, in the boiler 5a, heat is transferred from the exhaust gas having a high temperature to the heat medium having a low temperature by heat exchange. In other words, the heat medium extracts heat from the exhaust gas. As a result of the heat exchange, the exhaust gas flowing from the heat exchanger 4 through the path 63 is cooled to about 210 ° C. The exhaust gas cooled by the boiler 5a is supplied to the dust collector 7 via the path 64.

The heat medium used for heat exchange in the boiler 5a is supplied from the boiler 5a to the generator 6a. The generator 6a performs binary power generation using, for example, the supplied heat medium. The heat medium used for binary power generation is supplied to the heat medium circulation pump 31. The heat medium circulation pump 31 circulates the heat medium between the boiler 5a and the generator 6a. The circulation amount of the heat medium circulated by the heat medium circulation pump 31 is controlled by the VVVF inverter 32. In the present embodiment, the heat medium used for heat exchange in the boiler 5a is supplied to the generator 6a, but the supply destination of the heat medium is not limited to this, and is used for heat utilization equipment such as a dryer. May be supplied.

The dust collector 7 removes the exhaust gas flowing in from the boiler 5a via the path 63. The exhaust gas removed by the dust collector 7 is supplied to the heat exchanger 4 via the path 65. The dust collector 7 of the present embodiment is realized by, for example, a low temperature bug filter.

The exhaust gas flowing from the dust collector 7 to the heat exchanger 4 via the path 65 is used in the heat exchanger 4 for heat exchange with the exhaust gas flowing from the incinerator 3 through the path 62. As a result of heat exchange, the exhaust gas flowing in from the dust collector 7 is heated (reheated). The exhaust gas heated by the heat exchanger 4 is supplied to the supercharger 22 via the path 66. In the present embodiment, the exhaust gas flowing from the dust collector 7 to the heat exchanger 4 via the path 65 coexists with the exhaust gas flowing from the incinerator 3 through the path 62 in the heat exchanger 4. However, it may be a countercurrent.

The supercharger 22 includes a turbine 22a and a compressor 22b that rotates as the turbine 22a rotates. In the supercharger 22, the exhaust gas supplied from the heat exchanger 4 via the path 66 is used for the rotation of the turbine 22a. As the turbine 22a rotates, the compressor 22b begins to rotate and compressed air is generated. The exhaust gas used for the rotation of the turbine 22a is supplied to the boiler 5b via the path 67.

The boiler 5b extracts heat from the exhaust gas flowing from the supercharger 22 via the path 67. Since the cooling of the exhaust gas in the boiler 5b is realized in the same manner as the cooling of the exhaust gas in the boiler 5a described above, the description thereof will be omitted. The cooling of the exhaust gas in the boiler 5b may be realized by a means different from that of the boiler 5a described above.

The heat medium used for heat exchange in the boiler 5b is supplied from the boiler 5b to the generator 6b. Since the power generation in the generator 6b is realized in the same manner as the power generation in the generator 6a described above, the description thereof will be omitted. The power generation in the generator 6b may be realized by a means different from that of the generator 6a described above. Further, the generator 6a and the generator 6b may be shared as one generator. Further, as described above, the supply destination of the heat medium is not limited to the generator, and may be supplied to heat utilization equipment such as a dryer.

The bypass path 68 is a path for the exhaust gas discharged from the dust collector 7 to bypass the heat exchanger 4. The bypass path 68 is provided so as to connect the path 65 and the path 66. More specifically, the bypass path 68 is provided so that the exhaust gas can bypass the heat exchanger 4 between the inlet and the outlet of the path 72 of the heat exchanger 4. The exhaust gas discharged from the dust collector 7 may bypass the heat exchanger 4 via the bypass path 68. In this case, the exhaust gas discharged from the dust collector 7 is supplied to the supercharger 22 via the path 65, the bypass path 68, and the path 66. The amount of exhaust gas flowing into the bypass path 68 is controlled based on the opening degree of the bypass valve 21 provided in the bypass path 68.

The bypass path 69 is a path for the exhaust gas discharged from the heat exchanger 4 to bypass the supercharger 22. The bypass route 69 is provided so as to connect the route 66 and the route 67. The exhaust gas discharged from the heat exchanger 4 to the path 66 and the exhaust gas discharged from the dust collector 7 and bypassing the heat exchanger 4 via the bypass path 68 bypass the supercharger 22 via the bypass path 69. May be good. In this case, the exhaust gas discharged from the heat exchanger 4 to the path 66 and the exhaust gas discharged from the dust collector 7 and bypassing the heat exchanger 4 via the bypass path 68 are boilers via the bypass path 69 and the path 67. It is supplied to 5b. The amount of exhaust gas flowing into the bypass path 69 is controlled based on the opening degree of the bypass valve 23 provided in the bypass path 69.

_{The TI 8 measures the exhaust gas inlet temperature PV 1} of the exhaust gas flowing in from the boiler 5a via the path 64 at the inlet of the dust collector 7. The TI 8 transmits the measured exhaust gas inlet temperature PV ₁ to each of the TICs 11 to 14.

The incinerator control device 10 includes TIC11-14 and PLC15. The incinerator equipment control device 10 controls the operation of the entire incinerator equipment 1 based on the control by the TICs 11 to 14 and the PLC 15.

The TICs 11 to 14 control each control target based on the exhaust gas inlet temperature PV _{1 received from the TI 8.} Hereinafter, the control process executed by each of the TICs 11 to 14 _{based on the exhaust gas inlet temperature PV 1} is also referred to as a “first control process”. In the first control process, for example, PID control is performed. In PID control, TIC11-14 is a control signal that is proportional (Proportional), integrated (Integral), and differentiated (Derivative) to the difference between the input value (exhaust gas inlet temperature PV ₁ ) and the set value (starting temperature SV _1). Is output. The PLC 15 transmits a control signal to the control target based on the control signals received from each of the TICs 11 to 14. The control signal includes, for example, a control value indicating a control amount of each control target.

In the incinerator 1 of the present embodiment, the target temperature SV _{0 of the exhaust gas inlet temperature PV 1} of the exhaust gas flowing into the dust collector 7 is set. The target temperature SV ₀ is, for example, 210 ° C. The incinerator equipment control device 10 controls the operation of the entire incinerator equipment 1 so that the _{exhaust gas inlet temperature PV 1} is maintained at the target temperature SV _0. The exhaust gas inlet temperature PV ₁ may rise from _{the target temperature SV 0} due to changes in the properties of the dehydrated sludge charged into the incinerator 3. When the exhaust gas inlet temperature PV ₁ rises, the incinerator equipment control device 10 lowers _{the raised exhaust gas inlet temperature PV 1} to the target temperature SV _{0 by executing the first control process.}

Here, the type of the first control process will be described with reference to FIG. FIG. 2 is a diagram showing an example of the relationship between the first control process according to the present embodiment and the exhaust gas inlet temperature PV _{1 of the dust collector 7.} In the graph shown in FIG. 2, the horizontal axis shows the type of the second control process, and the vertical axis shows _{the exhaust gas inlet temperature PV 1 of the dust collector 7.} As shown in FIG. 2, the first control process includes a bypass flow rate control process, a heat extraction amount control process, a furnace temperature control process, and a water content control process.

In the bypass flow rate control process, the bypass flow rate, which is the amount of exhaust gas flowing through the bypass path 68, is controlled. The bypass flow rate changes as the opening degree of the bypass valve 21 changes. Therefore, in the bypass flow rate control process, the opening degree of the bypass valve 21 (controlled object) is controlled. The thickness of the graph of the bypass flow rate control process shown in FIG. 2 indicates the opening degree of the bypass valve 21. The thicker the graph, the larger the opening, and the thinner the graph, the smaller the opening. In the present embodiment, the start temperature SV _1-1 (first temperature) at which the bypass flow rate control process is started is set. The starting temperature SV _1-1 is, for example, 210 ° C. Therefore, when the exhaust gas inlet temperature PV ₁ becomes 210 ° C. or higher, the bypass flow rate control process is started. The opening degree of the bypass valve 21 is controlled to decrease as _{the exhaust gas inlet temperature PV 1 rises, for example.} Therefore, the opening degree of the bypass valve 21 gradually decreases from 210 ° C. In this case, the bypass flow rate gradually decreases according to the opening degree of the bypass valve 21. Then, when the exhaust gas inlet temperature PV ₁ reaches 230 ° C., the bypass valve 21 is fully closed.

In the heat extraction amount control process, the heat extraction amount that the boiler 5a extracts heat from the exhaust gas is controlled. The heat extraction amount changes as the circulation amount of the heat medium circulating in the boiler 5a changes. Therefore, in the heat extraction amount control process, the operation of the VVVF inverter 32 (controlled object) that controls the circulation amount of the heat medium circulating in the boiler 5a is controlled. The thickness of the graph of the heat extraction amount control process shown in FIG. 2 indicates the circulation amount of the heat medium. The thicker the graph, the larger the circulation amount of the heat medium, and the thinner the graph, the smaller the circulation amount of the heat medium. In the present embodiment, the start temperature SV _1-2 (second temperature) at which the heat extraction amount control process is started is set. The starting temperature SV _1-2 is, for example, 220 ° C. Therefore, when the exhaust gas inlet temperature PV ₁ reaches 220 ° C. or higher, the heat extraction amount control process is started. The circulation amount of the heat medium is controlled so as to increase as _{the exhaust gas inlet temperature PV 1 rises, for example.} Therefore, the circulation amount of the heat medium gradually increases from 220 ° C.

Here, with reference to FIG. 3, FIG. 3 shows _{an example of the relationship between the exhaust gas inlet temperature PV 1} of the dust collector 7 according to the present embodiment, the outlet temperature of the heat medium of the boiler 5a, and the circulation amount of the heat medium. It is a figure which shows. In the graph shown in FIG. 3, the horizontal axis shows the exhaust gas inlet temperature PV ₁ of the dust collector 7, the vertical axis on the left side shows the outlet temperature of the heat medium of the boiler 5a, and the right side of the vertical axis shows the circulation amount of the heat medium.

As shown in FIG. 3, the circulation amount of the heat medium is controlled so as to increase as the _{exhaust gas inlet temperature PV 1 rises.} On the other hand, the outlet temperature of the heat medium of the boiler 5a decreases as the exhaust gas inlet temperature PV ₁ increases. This is because the circulation amount of the heat medium is also increasing. When the outlet temperature of the heat medium of the boiler 5a decreases, the power generation efficiency of the generator 6a to which the heat medium is supplied may decrease. Therefore, if the heat extraction amount control process is executed when the exhaust gas inlet temperature PV _{1 rises, the power generation efficiency may decrease.} Therefore, in the present embodiment, the execution order of the heat extraction amount control process is delayed in the first control process. For example, the start temperature SV _1-2 of the heat extraction amount control process is set higher than the start temperature SV _1-1 of the bypass flow rate control process, and the execution order of the heat extraction amount control process is slower than that of the bypass flow rate control process. As a result, the number of times the heat extraction amount control process is executed can be suppressed, and the frequency with which the power generation efficiency is lowered can also be suppressed.

In the furnace temperature control process, the furnace temperature of the incinerator 3 is controlled. The temperature inside the furnace changes as the amount of cooling water sprayed into the incinerator 3 changes. Therefore, in the in-furnace temperature control process, the valve 42 (controlled object) that controls the amount of the cooling water sprayed into the incinerator 3 is controlled. The thickness of the graph of the in-furnace temperature control process shown in FIG. 2 indicates the amount of cooling water sprayed. The thicker the graph, the larger the amount of cooling water sprayed, and the thinner the graph, the smaller the amount of cooling water sprayed. In the present embodiment, the start temperature SV _1-3 (third temperature) at which the furnace temperature control process is started is set. The starting temperature SV _1-3 is, for example, 230 ° C. Therefore, when the exhaust gas inlet temperature PV ₁ reaches 230 ° C. or higher, the furnace temperature control process is started. The amount of the cooling water sprayed is controlled so as to increase as _{the exhaust gas inlet temperature PV 1 increases, for example.} Therefore, the amount of the cooling water sprayed gradually increases from 230 ° C. Then, when the exhaust gas inlet temperature PV ₁ reaches 240 ° C., the amount of sprayed cooling water becomes the maximum amount.

In the water content control process, the water content of the dehydrated sludge is controlled. The water content is controlled by the dewatering machine 2 that produces dewatered sludge. Therefore, in the water content control process, the operation of the dehydrator 2 (controlled object) that controls the water content is controlled. The thickness of the graph of the water content control process shown in FIG. 2 indicates the water content. The thicker the graph, the higher the water content, and the thinner the graph, the lower the water content. In the present embodiment, the start temperature SV _1-4 (fourth temperature) at which the water content control process is started is set. The starting temperature SV _1-4 is, for example, 230 ° C. Therefore, when the exhaust gas inlet temperature PV ₁ becomes 230 ° C. or higher, the water content control process is started. The water content is controlled to increase as the exhaust gas inlet temperature PV _{1 rises, for example.} Therefore, the water content gradually increases from 230 ° C.

_{If the rise in the exhaust gas inlet temperature PV 1} cannot be stopped even after the first control process is executed, it is determined that the operating state of the incinerator 1 is abnormal, and the operation of the incinerator 1 is stopped. _{In the present embodiment, the start temperature SV 1-5} is set as the temperature at which the operation of the incinerator 1 is stopped. The starting temperature SV _1-5 is, for example, 250 ° C. Therefore, when the exhaust gas inlet temperature PV ₁ reaches 250 ° C., the operation of the incinerator 1 is stopped. The temperature of 250 ° C. is a temperature considering the upper limit temperature of the exhaust gas flowing into the dust collector 7 (low temperature bug filter).

In the present embodiment, the start temperature of each control process of the first control process is set with a difference. For example, the start temperature is set in consideration of the effect of each control on the rise of the _{exhaust gas inlet temperature PV 1 and the time until the effect starts to appear.}

_{The bypass flow rate control process can lower the exhaust gas inlet temperature PV 1} within a few minutes from the start of control, and its effect is great. Therefore, the start temperature SV _1-1 is set to be the lowest among the start temperatures of each control process. As a result, when the exhaust gas inlet temperature PV ₁ rises, the bypass flow rate control process is started first in each control process.

The heat extraction amount control process has a large effect, but the time until the effect is obtained is slightly slower than that of the bypass flow rate control process. Therefore, the start temperature SV _1-2 is set to be the second lowest after the _{start temperature SV 1-1} in the start temperature of each control process. As a result, when the exhaust gas inlet temperature PV ₁ rises, the heat extraction amount control process is started next to the bypass flow rate control process.

The furnace temperature control process has the greatest effect among the control processes, and the time until the effect appears is the fastest. However, in consideration of the influence on the processing in the subsequent stage of the incinerator 3, the starting temperature SV _1-3 is set to be the second lowest after the _{starting temperature SV 1-2} in the starting temperature of each control processing. As a result, when the exhaust gas inlet temperature PV ₁ rises, the furnace temperature control process is started after the heat extraction amount control process. Therefore, the effect of controlling the bypass valve 21 and controlling the amount of heat extracted is weak, and when the exhaust gas inlet temperature PV ₁ continues to rise, the furnace temperature control process is executed, and the exhaust gas inlet temperature PV ₁ can be quickly lowered.

The water content control process has the slowest time to be effective in each control process, but each control related to the operation of the incinerator can be stabilized. On the other hand, the above-mentioned incinerator temperature control process has a quick response, but may increase the fluctuation of each control related to the operation of the incinerator. Therefore, the starting temperature SV _1-4 is set in the same temperature range as _{SV 1-3.} As a result, when the exhaust gas inlet temperature PV ₁ rises, the water content control process is started at the same time as the incinerator temperature control process, and the fluctuation of each control related to the operation of the incinerator is stabilized at an early stage. In the present embodiment, the start temperature SV _1-4 of the water content control process is set to be the same as, for example, the start temperature SV _{1-3 of the furnace temperature control process, but SV 1-4} is from SV _1-3 . It may be set high.

The TIC 11 executes, for example, a bypass flow rate control process. _{The start temperature SV 1-1} is set in the TIC 11 as a set value. The TIC 11 of the present embodiment starts the bypass flow rate control process when the _{exhaust gas inlet temperature PV 1} ≧ start temperature SV _{1-1. At this time, the TIC 11 generates a control signal SG 1-1} for controlling the opening degree of the bypass valve 21 by PID control and transmits it to the PLC 15. The PLC 15 _{that has received the control signal SG 1-1} from the TIC 11 transmits the _{control signal SG 1-3} to the bypass valve 21. At this time, the control signal SG _1-3 may be a signal containing the same information (for example, a control value) as the control signal SG _{1-1, or may be a signal containing different information.}

The TIC 12 executes, for example, a heat extraction amount control process. _{The starting temperature SV 1-2} is set as a set value in the TIC 12. The TIC 12 of the present embodiment starts the heat extraction amount control process when the _{exhaust gas inlet temperature PV 1} ≧ start temperature SV _{1-2. At this time, the TIC 12 generates a control signal SG 2-1} that controls the circulation amount of the heat medium circulating in the boiler 5a by PID control, and transmits the control signal SG 2-1 to the PLC 15. The PLC 15 _{that has received the control signal SG 2-1} from the TIC 12 transmits the _{control signal SG 2-3} to the VVVF inverter 32. At this time, the control signal SG _2-3 may be a signal containing the same information (for example, a control value) as the control signal SG _{2-1 or a signal containing different information.}

The TIC 13 executes, for example, an in-furnace temperature control process. _{The starting temperature SV 1-3} is set as a set value in the TIC 13. The TIC 13 of the present embodiment starts the furnace temperature control process when the _{exhaust gas inlet temperature PV 1} ≧ start temperature SV _{1-3. At this time, the TIC 13 generates a control signal SG 3-1} for controlling the opening degree of the valve 42 by PID control and transmits it to the PLC 15. The PLC 15 that has received the _{control signal SG 3-1} from the TIC 13 transmits the _{control signal SG 3-3 to the valve 42.} At this time, the control signal SG _3-3 may be a signal containing the same information (for example, a control value) as the control signal SG _{3-1 or a signal containing different information.}

The TIC 14 executes, for example, a water content control process. _{The starting temperature SV 1-4} is set in the TIC 14 as a set value. The TIC 14 of the present embodiment starts the water content control process when the _{exhaust gas inlet temperature PV 1} ≧ start temperature SV _{1-4. At this time, the TIC 14 generates a control signal SG 4-1} that controls the water content of the dehydrated sludge generated by the dehydrator 2 by PID control, and transmits the control signal SG 4-1 to the PLC 15. The PLC 15 that has received the _{control signal SG 4-1} from the TIC 14 transmits the _{control signal SG 4-3 to the dehydrator 2.} At this time, the control signal SG _4-3 may be a signal containing the same information (for example, a control value) as the control signal SG _{4-1 or a signal containing different information.}

Further, the PLC 15 may control the operation of the entire incinerator 1 based on the control by the TIC 24, TIC 33, TIC 43, and CIC 51. The TIC 24, TIC 33, TIC 43, and CIC 51 control each control target based _{on the measured value PV 2 for each control target (control target of the first control process).} Hereinafter, the control process executed by each of the TIC 24, TIC 33, TIC 43, and CIC 51 _{based on the measured value PV 2} is also referred to as a “second control process”. In the second control process, for example, PID control is performed in the same manner as in the first control process. In PID control, TIC24, TIC33, TIC43, and CIC51 are _{proportional to the difference between the input value (measured value PV 2} ) and the set value (target value SV ₂ ) (Proportional), integral (Integral), and derivative (Derivative). Output the applied control signal. The PLC 15 transmits a control signal to the control target based on the control signals received from each of the TIC 24, TIC 33, TIC 43, and CIC 51.

The TIC 24 executes, for example, a bypass flow rate control process. _{A target value SV 2-1} is set as a set value in the TIC 24. The TIC 24 of the present embodiment executes the bypass flow rate control process so that _{the temperature PV 2-1 of the} exhaust gas passing through the path 66 becomes the target value SV _{2-1. At the time of execution, the TIC 24 generates a control signal SG 1-2} that controls the opening degree of the bypass valve 21 by PID control, and transmits the control signal SG 1-2 to the PLC 15. The PLC 15 _{that has received the control signal SG 1-2} from the TIC 24 transmits the _{control signal SG 1-3} to the bypass valve 21. At this time, the control signal SG _1-3 may be a signal containing the same information (for example, a control value) as the control signal SG _{1-2, or may be a signal containing different information.} Further, the bypass path 68 may be provided with a flow rate controller (not shown) that transmits a set value of the bypass flow rate to the PLC 15. The PLC 15 may control the opening degree of the bypass valve 21 so as to reach the received set value.

The TIC 33 executes, for example, a heat extraction amount control process. _{A target value SV 2-2} is set as a set value in the TIC 33. The TIC 33 of the present embodiment executes the heat extraction amount control process so that _{the temperature PV 2-2 of the} heat medium flowing from the boiler 5a into the generator 6a becomes the target value SV _{2-2. At the time of execution, the TIC 33 generates a control signal SG 2-2} that controls the circulation amount of the heat medium circulating in the boiler 5a by PID control, and transmits the control signal SG 2-2 to the PLC 15. The PLC 15 _{that has received the control signal SG 2-2} from the TIC 33 transmits the _{control signal SG 2-3} to the VVVF inverter 32. At this time, the control signal SG _2-3 may be a signal containing the same information (for example, a control value) as the control signal SG _{2-2, or may be a signal containing different information.}

The TIC 43 executes, for example, an in-furnace temperature control process. _{A target value SV 2-3} is set as a set value in the TIC 43. The TIC 43 of the present embodiment executes the furnace temperature control process so that the furnace temperature _{PV 2-3} of the incinerator 3 becomes the target value SV _{2-3. At the time of execution, the TIC 43 generates a control signal SG 3-2} that controls the opening degree of the valve 42 by PID control, and transmits the control signal SG 3-2 to the PLC 15. Upon receiving the control signal SG _3-2 from the TIC 43, the PLC 15 transmits the _{control signal SG 3-3 to the valve 42.} At this time, the control signal SG _3-3 may be a signal containing the same information (for example, a control value) as the control signal SG _{3-2, or may be a signal containing different information.}

The CIC 51 executes, for example, a water content control process. _{A target value SV 2-4} is set as a set value in the CIC 51. The CIC 51 of the present embodiment executes the water content control process so that the water _{content PV 2-4 of the} dehydrated sludge passing through the path 61 becomes the target value SV _{2-4. At the time of execution, the CIC 51 generates a control signal SG 4-2} that controls the water content of the dehydrated sludge generated by the dehydrator 2 by PID control, and transmits the control signal SG 4-2 to the PLC 15. The PLC 15 that has received the _{control signal SG 4-2} from the CIC 51 transmits the _{control signal SG 4-3 to the dehydrator 2.} At this time, the control signal SG _4-3 may be a signal containing the same information (for example, a control value) as the control signal SG _{4-2, or may be a signal containing different information.}

<2. Functional configuration of incinerator control device>
The configuration of the incinerator 1 according to the present embodiment has been described above with reference to FIGS. 1 to 3. Subsequently, with reference to FIG. 4, the functional configuration of the incinerator equipment control device 10 according to the present embodiment will be described. FIG. 4 is a block diagram showing an example of the functional configuration of the incinerator equipment control device 10 according to the embodiment of the present invention.

As shown in FIG. 4, the incinerator equipment control device 10 includes a bypass flow rate control unit 110 (first control unit), a heat extraction amount control unit 120 (second control unit), and a furnace temperature control unit 130 (third control unit). , A water content control unit 140 (fourth control unit), and a treatment control unit 150 (fifth control unit).

(1) Bypass flow control unit 110
The bypass flow rate control unit 110 has a function of executing the bypass flow rate control process. The bypass flow rate control unit 110 controls the opening degree of the bypass valve 21 by the bypass flow rate control process, so that the amount of exhaust gas flowing from the dust collector 7 into the bypass path 68 is controlled. Thereby, the bypass flow rate in the bypass path 68 is controlled. Further, the inflow amount of the exhaust gas flowing from the dust collector 7 to the heat exchanger 4 is also controlled. This function is realized by, for example, the TIC 11 described with reference to FIG.

The bypass flow rate control unit 110 executes the bypass flow rate control process when, for example, the exhaust gas inlet temperature PV ₁ ≥ the start temperature SV _1-1. At this time, the bypass flow rate control unit 110 reduces the opening degree of the bypass valve 21 based on the _{exhaust gas inlet temperature PV 1.} The bypass flow rate control unit 110 calculates the control value of the opening degree of the bypass valve 21 by, for example, PID control. After the calculation, the bypass flow rate control unit 110 _{generates a control signal SG 1-1} including the calculated control value and outputs the control signal SG 1-1 to the processing control unit 150.

When the opening degree of the bypass valve 21 decreases, the bypass inflow amount in the bypass path 68 gradually decreases, and the inflow amount of the exhaust gas flowing into the heat exchanger 4 gradually increases. As a result, the amount of low-temperature exhaust gas in the heat exchanger 4 increases, so that the amount of heat transferred from the high-temperature exhaust gas also increases. Therefore, the amount of heat recovered from the high-temperature exhaust gas increases. Therefore, the temperature of the high-temperature exhaust gas discharged from the path 71 of the heat exchanger 4 is lowered. Therefore, the temperature of the exhaust gas discharged in the subsequent stage of the heat exchanger 4 also decreases, and the exhaust gas inlet temperature PV ₁ of the exhaust gas flowing into the dust collector 7 also decreases. In this way, the bypass flow rate control unit 110 can lower _{the exhaust gas inlet temperature PV 1} of the exhaust gas flowing into the dust collector 7 by reducing the opening degree of the bypass valve 21.

On the other hand, the temperature of the exhaust gas discharged from the path 72 of the heat exchanger 4 and supplied to the boiler 5b via the supercharger 22 or the bypass path 69 gradually rises. Therefore, the temperature of the heat medium circulating in the boiler 5b and the generator 6b also rises. As a result, the amount of power generated by the generator 6b that generates power using the heat medium increases. In this way, the bypass flow rate control unit 110 can increase the amount of power generated by the generator 6b by reducing the opening degree of the bypass valve 21.

When the exhaust gas inlet temperature PV ₁ is sufficiently lowered, the bypass flow rate control unit 110 may increase the opening degree of the bypass valve 21. Further, when the exhaust gas inlet temperature PV ₁ is raised, the bypass flow rate control unit 110 may increase the opening degree of the bypass valve 21.

(2) Heat extraction amount control unit 120
The heat extraction amount control unit 120 has a function of executing the heat extraction amount control process. The heat extraction amount control unit 120 controls the heat extraction amount for the exhaust gas in the boiler 5a by controlling the circulation amount of the heat medium circulating in the boiler 5a, for example. The function is realized by, for example, the TIC 12 described with reference to FIG.

The heat extraction amount control unit 120 executes the heat extraction amount control process, for example, when the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-2. At this time, the heat extraction amount control unit 120 increases the heat extraction amount based on the _{exhaust gas inlet temperature PV 1.} Specifically, the heat extraction amount control unit 120 increases the circulation amount of the heat medium that circulates in the boiler 5a, which is the heat medium boiler. The heat extraction amount control unit 120 calculates a control value of the circulation amount of the heat medium by, for example, PID control. When the boiler 5a is realized by a steam boiler, the heat extraction amount control unit 120 lowers the steam pressure value at the discharge port where the exhaust gas extracted by the steam boiler is discharged from the steam boiler. After the calculation, the heat extraction amount control unit 120 _{generates a control signal SG 2-1} including the calculated control value and outputs the control signal SG 2-1 to the processing control unit 150.

As the circulation amount of the heat medium increases, the amount of heat extracted from the exhaust gas in the boiler 5a increases. As a result, the temperature of the exhaust gas discharged from the boiler 5a is lowered. _{Therefore, the exhaust gas inlet temperature PV 1} of the exhaust gas flowing into the dust collector 7 also decreases. In this way, the heat extraction amount control unit 120 can lower _{the exhaust gas inlet temperature PV 1} of the exhaust gas flowing into the dust collector 7 by increasing the circulation amount of the heat medium circulating in the boiler 5a.

When the exhaust gas inlet temperature PV ₁ is sufficiently lowered, the heat extraction amount control unit 120 may reduce the circulation amount of the heat medium circulating in the boiler 5a. Further, when the exhaust gas inlet temperature PV ₁ is raised, the heat extraction amount control unit 120 may reduce the circulation amount of the heat medium circulating in the boiler 5a.

(3) In-furnace temperature control unit 130
The furnace temperature control unit 130 has a function of executing the furnace temperature control process. The furnace temperature control unit 130 controls the furnace temperature of the incinerator 3 by controlling the opening degree of the valve 42 provided in the path 70. The function is realized by, for example, the TIC 13 described with reference to FIG.

The furnace temperature control unit 130 executes the furnace temperature control process when, for example, the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-3. At this time, the furnace temperature control unit 130 increases the opening degree of the valve 42 based on the _{exhaust gas inlet temperature PV 1.} As a result, the furnace temperature control unit 130 sprays the cooling water from the nozzle 41 provided in the furnace of the incinerator 3. At this time, the furnace temperature control unit 130 calculates the control value of the opening degree of the valve 42 by, for example, PID control. _{After the calculation, the furnace temperature control unit 130 generates a control signal SG 3-1} including the calculated control value and outputs the control signal SG 3-1 to the processing control unit 150.

As the opening degree of the valve 42 increases, the amount of cooling water sprayed from the nozzle 41 through the path 70 provided with the valve 42 gradually increases. As a result, the temperature inside the incinerator 3 gradually decreases. Therefore, the temperature of the exhaust gas discharged from the incinerator 3 is lowered. Therefore, the temperature of the exhaust gas discharged in the subsequent stage of the incinerator 3 also decreases, and the exhaust gas inlet temperature PV ₁ of the exhaust gas flowing into the dust collector 7 also decreases. In this way, the furnace temperature control unit 130 can lower _{the exhaust gas inlet temperature PV 1} of the exhaust gas flowing into the dust collector 7 by increasing the opening degree of the valve 42.

When the exhaust gas inlet temperature PV ₁ is sufficiently lowered, the furnace temperature control unit 130 may reduce the opening degree of the valve 42. Further, when the exhaust gas inlet temperature PV ₁ is raised, the furnace temperature control unit 130 may reduce the opening degree of the valve 42.

(4) Moisture content control unit 140
The water content control unit 140 has a function of executing the water content control process. This function is realized by, for example, the TIC 14 described with reference to FIG.

The water content control unit 140 executes the water content control process when, for example, the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-3 or the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-4. At this time, the water content control unit 140 increases the water content of the dehydrated sludge based on the _{exhaust gas inlet temperature PV 1.} The water content control unit 140 calculates the control value of the water content of the dehydrated sludge by, for example, PID control. _{After the calculation, the water content control unit 140 generates a control signal SG 4-1} including the calculated control value and outputs the control signal SG 4-1 to the processing control unit 150.

As the water content of the dehydrated sludge increases, the calorific value during incineration of the dehydrated sludge decreases. As a result, the temperature of the exhaust gas discharged from the incinerator 3 is lowered. Therefore, the temperature of the exhaust gas discharged in the subsequent stage of the incinerator 3 also decreases, and the exhaust gas inlet temperature PV ₁ of the exhaust gas flowing into the dust collector 7 also decreases. In this way, the water content control unit 140 can lower _{the exhaust gas inlet temperature PV 1} of the exhaust gas flowing into the dust collector 7 by increasing the water content of the dehydrated sludge.

When the exhaust gas inlet temperature PV ₁ is sufficiently lowered, the water content control unit 140 may reduce the water content of the dehydrated sludge. Further, when the exhaust gas inlet temperature PV ₁ is raised, the water content control unit 140 may reduce the water content of the dehydrated sludge.

(5) Processing control unit 150
The process control unit 150 has a function of controlling the execution of the first control process and the second control process. This function is realized by, for example, the PLC 15 described with reference to FIG.

The processing control unit 150 basically transmits a control signal including the same information as the input control signal to the control target. For example, when the control signal SG _1-1 related to the first control process is input, the process control unit 150 is a bypass valve that controls the _{control signal SG 1-3} containing the same information as _{the control signal SG 1-1.} Send to 21. Similarly, when any of the control signal SG _2-1 , the control signal SG _3-1 and the control signal SG _4-1 is input, the processing control unit 150 performs the control signal SG _2-3 and the control signal SG _{3-. 3. The} control signal SG _4-3 is transmitted to each control target.

_{When the control signal SG 1-2} related to the second control process is input, the process control unit 150 controls the control signal SG _{1-3 containing the same information as the control signal SG 1-2.} Send to 21. Control signal _{SG 2-2,} the control signal _{SG 3-2,} similarly if any of the control signal _{SG 4-2} is input, the processing control unit 150, the control signal _{SG 2-3,} the control signal _{SG 3- 3. The} control signal SG _4-3 is transmitted to each control target.

When a control signal related to the first control process is input during the execution of the second control process, the priority of the first control process and the second control process is determined, and based on the determined priority, the first control process or The execution of the second control process is controlled. Therefore, the processing control unit 150 can transmit a control signal including information different from the input control signal to the control target.

Specifically, the processing control unit 150 determines the priority of each processing based on the operating state of the entire incinerator 1, the second control processing being executed, the urgency of the first control processing scheduled to be executed, and the like. After the determination, the processing control unit 150 updates the control value of the control target in the first control processing according to the priority. Specifically, the processing control unit 150 updates the control value of the control target included in the input control signal related to the first control processing. Then, the control signal with the updated control value is transmitted to the control target.

As an example, when the furnace temperature is controlled as the second control process, the control signal SG _1-1 related to the control of the bypass valve 21 is input to the process control unit 150 as the control signal related to the first control process. An example will be described.

In the case of this example, the incinerator 3 provided in front of the bypass valve 21, which is the control target of the _{control signal SG 1-1, controls the temperature inside the furnace, which is the second control process.} Therefore, as a result of the second control process, the temperature of the exhaust gas inlet temperature PV ₁ can be lowered without performing the first control process. Therefore, the process control unit 150 determines that the priority of the first control process scheduled to be executed is lower than the priority of the second control process being executed. Since it is determined that the priority of the first control process is low, the process control unit 150 updates the control value included _{in the control signal SG 1-1 so that the execution of the first control process is suppressed.} For example, the processing control unit 150 updates the control value so as to reduce the opening degree of the bypass valve 21. Alternatively, the processing control unit 150 may update the control value so as not to change the opening degree of the bypass valve 21. After the update, the processing control unit 150 _{transmits the control signal SG 1-3} including the updated control value to the bypass valve 21.

The processing control unit 150 may control the first control processing and the second control processing so as to give priority to maximizing the amount of power generation in the generators 6a and 6b.

<3. Process flow>
As described above, the functional configuration of the incinerator equipment control device 10 according to the present embodiment has been described with reference to FIG. Subsequently, with reference to FIG. 5, the flow of processing in the incinerator equipment control device 10 according to the present embodiment will be described. FIG. 5 is a flowchart showing an example of a processing flow in the incinerator equipment control device 10 according to the embodiment of the present invention.

As shown in FIG. 5, first, the incinerator equipment control device 10 _{acquires the exhaust gas inlet temperature PV 1} of the dust collector 7 (S102). Next, the incinerator equipment control device 10 performs a determination process of the first control process to be executed based on the _{acquired exhaust gas inlet temperature PV 1} and the start temperature SV _1. The determination process and the execution of the first control process based on the determination result are executed in parallel.

When the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-1 (S104 / YES), the incinerator equipment control device 10 executes the bypass flow rate control process (S106). If the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-1 (S104 / NO), the incinerator control device 10 advances the process to S124.

When the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-2 (S108 / YES), the incinerator equipment control device 10 executes the heat extraction amount control process (S110). When the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-2 is not satisfied (S108 / NO), the incinerator control device 10 advances the process to S124.

When the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-3 (S112 / YES), the incinerator equipment control device 10 executes the incinerator temperature control process (S114). When the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-3 is not satisfied (S112 / NO), the incinerator control device 10 advances the process to S124.

When the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-4 (S116 / YES), the incinerator equipment control device 10 executes the water content control process (S118). If the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-4 (S116 / NO), the incinerator control device 10 advances the process to S124.

When the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-5 (S120 / YES), the incinerator equipment control device 10 stops the operation of the incinerator equipment 1 (S122). If the exhaust gas inlet temperature PV ₁ ≧ start temperature SV _1-5 (S120 / NO), the incinerator control device 10 advances the process to S124.

When the first control process is started (S124 / YES), the incinerator equipment control device 10 advances the process to S126. When the first control process is not started (S124 / NO), the incinerator equipment control device 10 repeats the process from S102.

When the second control process is being executed (S126 / YES), the incinerator equipment control device 10 determines the priority (S128). When the second control process is not being executed (S126 / NO), the incinerator equipment control device 10 repeats the process from S102.

After determining the priority, the incinerator equipment control device 10 updates the control value (S130). After updating the control value, the incinerator equipment control device 10 repeats the process from S102.

_{As described above, in the incinerator control device 10 according to the present embodiment, the exhaust gas inlet temperature PV 1} of the exhaust gas at the inlet of the dust collector 7 into which the exhaust gas extracted by the boiler 5 flows is the starting temperature SV _1-1 or higher. When, the bypass flow rate control process for controlling the bypass flow rate in the bypass path 68 is executed. Further, the incinerator control device 10 controls the amount of heat extracted by the boiler 5a from the exhaust gas when the _{exhaust gas inlet temperature PV 1} is higher than the starting temperature SV _1-1 and is equal to or higher than the starting temperature SV _1-2. Execute control processing.

With this configuration, when the exhaust gas inlet temperature PV ₁ is equal to or higher than the start temperature SV _1-1 , the inflow amount of the low temperature exhaust gas flowing from the dust collector 7 to the heat exchanger 4 is controlled by the bypass flow rate control process. As a result, in the heat exchanger 4, the amount of the low-temperature exhaust gas to which the heat of the high-temperature exhaust gas flowing from the incinerator 3 is transferred is controlled. Therefore, the amount of heat transferred from the high temperature exhaust gas to the low temperature exhaust gas is controlled. That is, in the heat exchanger 4, the amount of heat recovered from the high-temperature exhaust gas is also increased by the inflow of the low-temperature exhaust gas adjusted so that _{the exhaust gas inlet temperature PV 1} approaches the target temperature SV _{0 by the bypass flow rate control process.} It will be adjusted.

Further, when the exhaust gas inlet temperature PV ₁ is higher than the start temperature SV _1-1 and is equal to or higher than the start temperature SV _1-2 , the amount of heat extracted by the boiler 5a from the exhaust gas is controlled by the heat extraction amount control process. In the heat extraction amount control process, the circulation amount of the heat medium, which is a low temperature object in the boiler 5a, is controlled. Thereby, in the boiler 5a, the amount of heat transferred from the high temperature exhaust gas flowing from the heat exchanger 4 to the heat medium is controlled. That is, in the boiler 5a, the amount of heat recovered from the high-temperature exhaust gas is also adjusted by circulating an amount of heat medium adjusted so that _{the exhaust gas inlet temperature PV 1} approaches the target temperature SV _{0 by the heat extraction amount control process.} ..

From the above, the incinerator equipment control device 10 according to the present embodiment can make each controlled object recover an amount of heat adjusted so _{that the exhaust gas inlet temperature PV 1} approaches the target temperature SV _0. Therefore, in the incinerator 1 according to the present embodiment, the cooler is miniaturized or omitted by controlling the incinerator control device 10, and the exhaust gas inlet temperature PV ₁ at the inlet of the dust collector is set to the target temperature SV _0. At the same time, the heat of the exhaust gas can be recovered.

Further, in the incinerator 1 according to the present embodiment, the temperature of the exhaust gas discharged from the incinerator 3 reaches the inlet of the dust collector 7 under the control of the incinerator control device 10 without using a cooling tower. Can be lowered. In the incinerator 1, the temperature of the exhaust gas discharged from the incinerator 3 is lowered to 210 ° C. by the time it reaches the inlet of the dust collector 7. As a result, in the incinerator 1, a low-temperature bug filter, which is more versatile than the high-temperature bug filter, can be used as the dust collector 7. From the above, the incinerator 1 according to the present embodiment can be simplified and generalized. Therefore, the control process of the incinerator equipment control device 10 according to the present embodiment is also effective for the equipment environment.

Further, in the incinerator 1 according to the present embodiment, the heat recovered by the heat exchanger 4 by the bypass flow rate control process and the heat recovered by the boiler 5a by the heat extraction amount control process are used in the subsequent process. .. For example, the recovered heat is used for power generation in the generator 6. Therefore, the incinerator control device 10 according to the present embodiment can recover heat by the bypass flow rate control process and the heat extraction amount control process without causing heat loss in the heat exchanger 4 and the boiler 5a.

Further, in the incinerator 1 according to the present embodiment, the incinerator control device 10 determines the priority of each control of the first control process and the second control process, and executes the control process according to the priority. The priority is determined based on the operating state of the entire incinerator 1, the urgency of the second control process being executed, the first control process scheduled to be executed, and the like. Therefore, the incinerator equipment control device 10 according to the present embodiment can execute the control process according to the operating state of the incinerator facility 1 and the urgency of each control process.

<4. Modification example>
The embodiment of the present invention has been described above. Subsequently, a modified example of the embodiment of the present invention will be described. In addition, each modification described below may be applied to the embodiment of the present invention alone, or may be applied to the embodiment of the present invention in combination. Further, each modification may be applied in place of the configuration described in the embodiment of the present invention, or may be additionally applied to the configuration described in each embodiment of the present invention.

In the above-described embodiment, an example in which PID control is used in the incinerator equipment control device 10 has been described, but the present invention is not limited to such an example.

For example, in the incinerator equipment control device 10, multivariable control may be used. Fuzzy control is an example of multivariable control. In fuzzy control, the order in which the control process for each control target is started and the control state are changed based on the temperature, the rate of change in temperature, and other conditions currently measured in the entire incinerator 1. For example, in fuzzy control, the execution order of the first control process is changed based on _{the exhaust gas inlet temperature PV 1 of the dust collector 7.} Further, in fuzzy control, the urgency of the control process to be executed is determined based on the rate of increase of the exhaust gas inlet temperature PV _{1, and the control value is updated according to the urgency.}

Further, in the incinerator equipment control device 10, model prediction control may be used. In the model predictive control, a response model capable of simulating the state of the actual system of the incinerator 1 is created in the computer. The incinerator equipment control device 10 uses the response model to simulate the influence of execution of the control process, and performs model predictive control for calculating the optimum operation.

More specifically, an example in which a process simulation model is used as a response model will be described. The incinerator equipment control device 10 gives an input in which the operation amount is changed to the process simulation model, and calculates the optimum condition which is the optimum target value in consideration of the constraint condition. The constraint conditions are, for example, the upper limit of the temperature of the dust collector, the upper and lower limits of each control value, the limit of the rate of change of each control value, and the like. The target value is, for example, a value indicating that both the amount of heat recovered and the amount of power generation are maximized. Since the calculation by the incinerator control device 10 predicts the future plant response, the predicted number of operation amount changes, the number of process response predictions, and the like can be changed to the optimum values in advance. Based on the optimum solution calculated by the incinerator equipment control device 10, a control signal including a control value is transmitted to the controlled object, and the actual process is operated. The incinerator equipment control device 10 continuously executes feedback control for performing the optimum calculation again based on the operation result of the actual process. As a result, the incinerator equipment control device 10 can achieve the optimum operation of the controlled object.

The modified example of the embodiment of the present invention has been described above. The incinerator control device 10 according to the above-described embodiment may be realized by a computer. In that case, the program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed. The term "computer system" as used herein includes hardware such as an OS and peripheral devices. Further, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, or a storage device such as a hard disk built in a computer system. Further, a "computer-readable recording medium" is a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short period of time. In that case, a program may be held for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client. Further, the above program may be for realizing a part of the above-mentioned functions, and may be further realized for realizing the above-mentioned functions in combination with a program already recorded in the computer system. It may be realized by using a programmable logic device such as FPGA (Field Programmable Gate Array).

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the gist of the present invention. It is possible to do.

1 ... incinerator, 2 ... dehydrator, 3 ... incinerator, 4 ... heat exchanger, 5a, 5b ... boiler, 6a, 6b ... generator, 7 ... dust collector, 8 ... TI, 10 ... incinerator control device, 11 ~ 14,24,33,43 ... TIC, 15 ... PLC, 21 ... Bypass valve, 22 ... Supercharger, 23 ... Bypass valve, 31 ... Heat medium circulation pump, 32 ... VVVF inverter, 41 ... Nozzle, 42 ... Valve , 51 ... CIC, 110 ... Bypass flow control unit, 120 ... Heat extraction amount control unit, 130 ... Inverter temperature control unit, 140 ... Moisture content control unit, 150 ... Processing control unit

Claims (9)

A heat exchanger that allows the high-temperature exhaust gas discharged from the incinerator to pass through and reheats with the high-temperature exhaust gas.
A boiler into which the exhaust gas discharged from the heat exchanger flows in, and
A dust collector that removes exhaust gas discharged from the boiler,
A bypass path in which the exhaust gas discharged from the dust collector bypasses the heat exchanger in which the exhaust gas discharged from the dust collector is reheated.
It is an incinerator control device in an incinerator equipped with
A first control unit that controls the bypass flow rate of the exhaust gas flowing through the bypass path, and
A second control unit that controls the amount of heat extracted from the exhaust gas discharged from the heat exchanger by the boiler, and
With
The first control unit reduces the bypass flow rate when the exhaust gas inlet temperature at the inlet of the dust collector into which the exhaust gas extracted by the boiler flows is equal to or higher than the first temperature.
The second control unit is an incinerator equipment control device that increases the amount of heat extracted when the exhaust gas inlet temperature is equal to or higher than the second temperature higher than the first temperature. The boiler is a heat medium boiler and
The incinerator equipment control device according to claim 1, wherein the second control unit increases the circulation amount of the heat medium circulating in the heat medium boiler. The boiler is a steam boiler,
The incinerator equipment control device according to claim 1, wherein the second control unit reduces the steam pressure value at the discharge port where the exhaust gas extracted by the boiler is discharged from the steam boiler. A third control unit for controlling the temperature inside the incinerator is further provided.
The third control unit sprays cooling water from a nozzle provided in the incinerator when the exhaust gas inlet temperature is higher than the second temperature and is equal to or higher than the third temperature. The incinerator equipment control device according to any one of 3. A fourth control unit that controls the water content of the incinerator to be incinerated is further provided.
The fourth control unit determines the water content of the incinerator generated by the dehydrator when the exhaust gas inlet temperature is equal to or higher than the third temperature or higher than the third temperature. The incinerator equipment control device according to claim 4, which is increased. Further equipped with a fifth control unit
The fifth control unit determines the priority of the first control process executed based on the exhaust gas inlet temperature and the second control process executed based on the measured value of the controlled object of the first control process. The incinerator equipment control device according to any one of claims 1 to 5, which controls the execution of the first control process or the second control process based on the determined priority. The incinerator equipment control device according to claim 6, wherein the fifth control unit updates the control value of the control target in the first control process according to the priority. A heat exchanger that allows the high-temperature exhaust gas discharged from the incinerator to pass through and reheats with the high-temperature exhaust gas.
A boiler into which the exhaust gas discharged from the heat exchanger flows in, and
A dust collector that removes exhaust gas discharged from the boiler,
A bypass path in which the exhaust gas discharged from the dust collector bypasses the heat exchanger in which the exhaust gas discharged from the dust collector is reheated.
It is an incinerator control method in an incinerator equipped with
The first control unit controls the bypass flow rate of the exhaust gas flowing through the bypass path.
The second control unit controls the amount of heat extracted from the exhaust gas discharged from the heat exchanger by the boiler.
Including
The first control unit reduces the bypass flow rate when the exhaust gas inlet temperature at the inlet of the dust collector into which the exhaust gas extracted by the boiler flows is equal to or higher than the first temperature.
The second control unit is an incinerator equipment control method for increasing the amount of heat extracted when the exhaust gas inlet temperature is equal to or higher than the second temperature higher than the first temperature. A heat exchanger that allows the high-temperature exhaust gas discharged from the incinerator to pass through and reheats with the high-temperature exhaust gas.
A boiler into which the exhaust gas discharged from the heat exchanger flows in, and
A dust collector that removes exhaust gas discharged from the boiler,
A bypass path in which the exhaust gas discharged from the dust collector bypasses the heat exchanger in which the exhaust gas discharged from the dust collector is reheated.
It is a program in the incinerator equipped with
Computer,
A first control unit that controls the bypass flow rate of the exhaust gas flowing through the bypass path, and
A second control unit that controls the amount of heat extracted from the exhaust gas discharged from the heat exchanger by the boiler, and
To function as
The first control unit reduces the bypass flow rate when the exhaust gas inlet temperature at the inlet of the dust collector into which the exhaust gas extracted by the boiler flows is equal to or higher than the first temperature.
The second control unit is a program that increases the amount of heat extracted when the exhaust gas inlet temperature is equal to or higher than the second temperature higher than the first temperature.

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